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For March to have this much warmth for this long is about a once-in-a-decade event.

If the forecasts are correct, it will be the hottest March week since 2002, when the average maximum was 29.6.

It will come as no surprise that March overall is almost certain to end up being hotter than February, something that has happened only 17 times in the past 100 years.

Quieter-than-normal monsoonal activity in the tropics has allowed the interior to be sunnier than normal and for heat to build. This heat has combined with a slow-moving weather pattern where a blocking high near New Zealand has been deflecting strong fronts south of NSW, keeping Sydney in warm northerly winds on most days.

For those who prefer more typical autumn weather, a fairly strong front will arrive late on Thursday, bringing a cooler southerly change and some rain. That should move north on Good Friday.